Look to the top of this page and you will see a blue link to "Magazine" Click on that and scroll down the page until you see the section with drop down menu's, to-ward the bottom of the page.
Open up the "Series" one and you will see "Computer build" click on that and you will be able to download a three part series that the Magazine did on this subject last year.
There is a small fee to pay, but the documents can be downloaded in PDF format for you to print off and keep. This will be an excellent starting point for you, then you can come back to the help room with any questions or help that you need. Good luck in building your PC. J.